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"The estate surveys known as "the Polyptych of Montier-en-Der " and found in a cartulary dating from the years 1124–?1130, are a heterogeneous collection, the earliest sections of which go back to Carolingian times. The first part of the present study attempts to distinguish the various strata in the document and to establish a chronology, as well as the authors’ aims, by meticulously analyzing the textual data in the two main Carolingian records (record of estates held in dominico and record of estates granted in precaria). The second part considers how the monks of Der Abbey later used (and abused) those Carolingian records in order to restore their patrimony; it reopens the file on various falsified deeds from the second half of the tenth or the very beginning of the eleventh century, suggesting a new date for Charles the Bald’s forged diploma of January 24, 858 (TESSIER, no 475), and reveals an interpolation in chapter 48 (Saint-Dizier) of the polyptych. "